daggett



Aug. 18, 1959 B, DAGGETT 2,899,847

MACHINE FOR SHARPENING HANDSAWS Filed Dec. 21, 1956 5 Sheet-Sheet 1 IN V EN TOR. BYRON a. DAGGETT Aug. 18, 1959 B. e. DAGGETT 2,899,847

MACHINE FOR SHARPENING HANDSAWS Filed Dec. 21, 1956 s Sheets-Sheet 2 4 INVENTOR. 7- F I g. 5 BYRON 6. 01166577 18 23 BY 2 a 2' g A 7' TORNE Y Aug. 18, 1959 Y B. G. DAGGETT 2,899,847

MACHINE FOR SHARPENING HANDSAWS Filed Dec. 21, 1956 5 Sheets-Sheet 5 INVENTOR.

BYRON 6.0466577 ATTORNEY 1959 B. G. DAGGETT 2,899,847

MACHINE FOR SHARPENING HANDSAWS 'Filed Dec. 21, 1956 5 Sheets-Sheet 4 IN V EN TOR.

BYZ 2.

ATTORNEY BYRON 6. DAGGETT Aug. 18, 1959 B. G. DAGGETT MACHINE FOR SHARPENING HANDSAWS Filed Dec. 21, 1956 5 Sheets-Sheet 5 IN VEN TOR.

BYRON 6. DAGGETT 2,899,847 1C6 I Patented Aug. 18, 195 9 MACHINE FOR SHARPENING HANDSAWS Byron G. Daggett, San Diego, Calif.

Application December 21, 1956, Serial No. 629,887

Claims. (Cl. 76-43) My invention relates to improvements in machines for sharpening carpenters hand saws, particularly after they have been worn to a taper or diminishing thickness under the conditions of actual use; and its objects are more especially to effect various improvements upon the machine for such purpose, disclosed in US. Patent No. 2,333,298, issued to me November 2, 1943, and entitled Machine for Shapening Handsaws, including changes in the equalizing guide, cam-pathed wheel, and handle operated mechanism therefor; to render the parts readily accessible for inspection, adjustment, replacement, renovation and repair; and in general to provide a greatly improved machine for sharpening handsaws, which is simple and economical of construction, saving of labor, efiicient in action and of prolonged life and durability. My invention further consists of other novel featucrs of construction, and combinations and arrangements of elements and parts illustrated in the drawing, and hereinafter more particularly described and claimed.

Attention is hereby directed to the accompanying drawing, illustrating a preferred form of said improvements, in which similar numerals of designation refer to similar parts throughout the several views, and in which:

Fig. 1 is an enlarged plan view of my improved equalizing guide and parts thereof adjacent to the toothed edge of the saw;

Fig. 2 is a side elevation of the equalizing guide shown in Fig. 1;

Fig. 3 is an enlarged end elevation of said equalizing guide, looking in the direction indicated by the arrows 3-3;

' Fig. 4 is a side elevation of my improved cam-pathed wheel, and adjacent parts, employed for controlling the two positions 'of the abrasive wheel;

Fig. 5 is a central vertical section of the improved campathed wheel and adjacent parts shown'in Fig. 4;

Fig. 6 is'an end view of the cam-pathed wheel shown in Fig. 4, looking in the direction indicated by the arrows 66', and showing the employment of a planetary gear for the rotation of said wheel;

Fig. 7 is an enlarged rear elevation of my improved detachable pulley and belt mechanism and adjacent parts for mechanically driving said cam-pathed wheel, as connected with the shaft of the motor, showing the same in operative position, with the hand operated parts in idle pos o Fig. 8 is an end view, partly in section, of the parts shown in Fig. 7, looking in the direction indicated by the arrows 8--8;

Fig. 9 is a front elevation of the hand operated mechanism shown in Figs. 7 and 8, certain parts of which behind the wall of the machine are shown in phantom;

Fig. 10 is a view similar to that shown in Fig. 7, but showing the motor connected mechanism in idle position, whilethe hand operated mechanism is an operative position;

' Fig. "11 is a vertical section of the principal assembled moving parts of my improved machine, showing certain parts in elevation, and

Fig. 12 is a view, partly in section, on line 1212 of Fig. 11, looking in the direction indicated by the arrows, illustrating the cam-pathed wheel of my former machine, for controlling the two positions of the abrasive wheel.

Referring to the drawings, the parts of my improved machine there shown constitute changes and improvements upon corresponding parts of my machine for sharpening handsaws covered by US. Patent No. 2,333,298, issued to me on November 2, 1943, being confined to changes and improvements of the equalizing guide, the cam-pathed wheel and means for detachably manually or mechanically operating the machine.

The construction of the modification of the equalizing guide 88 of my said patent is shown in Figs. 1, 2 and 3, said guide being adjustably secured to the member 79 mounted upon the main frame of the machine, and said guide having the yoke 90, and, integral therewith and rearwardly extending therefrom, the flat members 92 and 93, equally spaced from the path of the saw lying therebetween. Pivotally connected with the free ends of said members, and positioned to be brought in sliding contact withopposite sides of the saw 85 are the shoes 92a and 9311, respectively provided with the longitudinally curved soles 92b and 93b, preferably flattened laterally as shown.

Hingedly connected by a bolt 10 to the inner end 11 of the yoke 90, near one side thereof, is the broad portion 12 of the lever 13, the free portion thereof forming the handle 14; and pivotally connected with said portion 12 are the elbows 15 and 16; the elbow 15 extending above and across the path of the saw and bending downwardly to be pivotally connected with the free end of the shoe 92a, and the elbow 16 extending inwardly and bending downwardly to be pivotally connected with the free end of the shoe 93a; and the said shoes being located to make sliding contact with the sides of the saw passing therebetween. Connected to the handle 14 and to the end of the yoke 90, respectively, are the ends of the spring a; the said spring serving at all times to cause the said shoes to maintain their close sliding contact with the opposite sides of the saw, with equal pressure thereon positively exerted from opposite directions.

Of great advantage in the exercise of my invention is this improved form of equalizing guide when used to sharpen the set teeth of a commercial handsaw where the parts of the saw coming in contact with the work have become abraded and the saw has been reduced in thickness even to a slight degree; the result being that when said handsaw is placed in a holder operatively arranged to move to and from the abrasive wheel 25 an adjustment should be made to allow for these differences in thickness in order that better correct registering contact may be made with the teeth of the saw. It is for this purpose that this present and more improved form of my equalizing guide is designed and constructed. I have found that to secure the proper co-operation of the abrasive wheel with the feed finger it is essential that the saw teeth coming in contact with said wheel must be properly centered at all times and firmly held against lateral movement. For normal contact of the feed finger with the saw teeth, this accurate centering must be carefully preserved, for since said finger contacts each tooth, which is set at an angle, such angular impingement should at all times be maintained. If the edge of the saw be pressed out of the center of the line of feed, the edge of the abrasive wheel will not register with the tooth. To bring about and preserve the necessary alignment, 1 have found that it is essential to apply simultaneously to the saw blade, pressure coming from two opposite or cont-rary' directions, such pressure becoming equalized when r j 3 r the toothed edge of the saw is brought into the central line of travel of the saw and properly centered for operation.

The form of equalizing guide shown inmy said patent while'perforining the same function as my improved form of such guide does not perform the said function as efficiently or in substantially the same, way. Such old form is cumbrous and because of a multiplicity of parts, is diflicult to keep in running order without frequent attention and repair. Furthermore, the yoke clamps thereof, astride the saw, always present flat surfaces contacting the same, without means for tightening or releasing the pressure of said contacts, or permitting play therebetween. Whereas, in my improved form of guide, there is a great simplification of parts, and in providing the shoes 92a and 93a with longitudinally curved soles laterally flattened contacting the sides of the saw a better means of centering the saw in its central path through the machine is secured, and said contacts may be tightened or relaxed by replacement of the elbows 15 and 16, by long or short elbows as desired.

The construction of my improved cam-pathed wheel 42a and planetary gear, adapted for securing the accurate reduction of rotation thereof and conforming thereto, is shown in detail in Figs. 4, 5 and 6, where, in place of the two recessed channels in the periphery of the wheel (equally spaced apart, and connected by angularly intersecting by-passes) as shown in my said patent, I have substituted a single continuous undulating campath 410: impressed within and extending around said periphery and located to contact the shoe 4t} and to be connected to permit the same to travel therein in performance of the same function as the former device, although in a substantially different and more efficient way, and constituting a new and beneficial result. Thus, the shoe 40 is secured to the arm 39 attached to the lower end of the shaft 31 journalled within bearings in the bracket 38 on the main frame, and the shaft 31 is operatively connected to cause the abrasive wheel to rotate in two angular paths conforming to the set of the saw together with co-ordinating mechanism for moving the carriage of the saw to and from said abrasive wheel to contact the teeth of said saw with said abrasive wheel, all as set forth in said patent. In the cam-pathed wheel of my patent, however, I have found the arrangement of the two recessed channels 41, interconnected by criss-cross by-passes, to be cumbrous, unwieldly, inefiicient and unsatisfatcory, in that, unless very carefully and constantly adjusted, the shoe 4% is likely at times to become jammed at the crossing of said by-passes, requiring the machine immediately to be stopped for overhaul and repair. Whereas, in my improved cam-pathed wheel, the provision of a single continuous tortuous campath 41a and new co-ordinating mechanism as supplied by my present invention, any such jamming and stoppage of the machinery is rendered impossible. As shown in the drawing, the cam-pathed wheel is mounted upon the end of the main shaft 43, journalled in suitable bearings upon the lower part of the main portion of my machine.

To rotate the said wheel 42a, I preferably employ a epicycle or planetary train 19 of gears more particularly shown in Fig. 6; said train comprising the circumferentially extending internal tooth gear 17a, welded to, and inside of, the rim 18 of wheel 42a and positioned to mesh with the two planet gears 19a and 191), both of which mesh with the sun gear 19c, and said gear 19c being mounted upon the sleeve 20, secured by the key 21 to the cam-shaft 43. Also keyed to the hub of the sleeve 20 is the pulley 22, operated by the belt 23, connected with the shaft of the drive motor (not shown).

Referring to Figs. 7 to 10, I have there shown a ready and efficient means for using separately either the manualliy controlled handle or the motor connected mechanism for driving the cam-pathed wheel, which driving parts in my older form of machine are inseparable. Thus, while in my patented machine the said wheel 42 is provided with the belt groove 44 in the end thereof driven by a belt 45 from the groove of a pulley mounted upon the shaft of a drive motor, it is found necessary also to provide running in said groove the belt 47 positioned to be actuated by a pulley mounted upon a separate shaft 49, journalled in suitable bearings on the main frame, which shaft 49 is turned by the handle 50. As a result of each arrangement and assoication of parts in my patented machine, the hand operated means for turning the cam-pathed wheel is inseparable from the mechanical means for effecting such turning; andboth of said means when active are in simultaneous operation.

In my new and improved machine, however, as herein set forth, I provide a construction for effectively separating the two turning mechanisms, and for allowing the operation of either while the other is in idle operation. As shown in Figs. 7 to 10, I have dispensed with the additional belt 47 of the former construction as a means for connecting the handle operated mechanism, and have relied upon but one belt 45 connecting the belt groove 44, at the end of the wheel 42, with the pulley 46a mounted upon the shaft 56b of a drive motor.

In Figs. 7 and 8, the pulley and belt mechanism are adjusted for the driving of the cam-pathed wheel solely from a drive motor. To effect such operation, I provide the downwardly extending control arm 24, the elbow 24a of which is pivotally attached by the pin 24bto the wall of the frame 17, and to the lower part of which arm [is firmly affixed to the rod 25, extending horizontally at right angles thereto, and provided with the handle 26.

Pivotally secured to the wall of the frame 17, and adjacent thereto and slidably resting on the rod 25 is one end of the bar 26, the free end of said bar being bent downwardly to form the catch 26a. Protruding inwardly from said arm 24 and integral therewith is the finger 24c, upon which is mounted the grooved roller 24d, positioned to move into and out of engaging contact with the inner side of the belt 45, and when in such contact to ride thereon.

Normally to maintain yielding contact of the groove of the roller 24d with the belt 45, I provide the compression spring 24 one end of which is attached to the wallof the frame 17, and the other end of which is secured to one of the line of openings 25a formed in the elbow 24a. Also, to furnish cushioning sliding contacts as between the arm 24 and the outside portion of the belt 45, I adjustably secure to the said arm 24 the bufiers 24e positioned to guide the said belt while traveling over the roller 24d.

Pivotally attached to the wall of the frame 17 by a bolt 27 is the goose-neck member 28, having mounted upon the shank 28a thereof the clevis 29, provided with the roller 29a, positioned to be brought into engaging contact with the outside of the belt 45, and having pivotally mounted upon the shaft 30, journalled within bearings upon said shank, the grooved roller 2% located to be brought into engaging contact with the inside of said belt; the said roller 29a and the grooved roller 2% serving to make clamping contact with the belt 45 in the manner shortly to be described. As shown, the goose-neck 28b of the member 28 is positioned to curve inwardly just above the pulley 46a of the motor 46, and isprovided with a catch 28c, positioned to make engaging contact with the rounded end of the finger 24c. Firmly secured to the shaft 30, and serving manually to rotate the same, is the crank handle 30a.

In Figs. 9 and 10, I have shown the pulley and belt mechanism as adjusted for the driving of the cam-pathed wheel solely through the manipulation of hand operated mechanism. For such purpose, the arm 24 is turned inwardly so as to effect engagement of the end of the finger 24c with the catch 280 of the goose-neck 28, at which time the roller 24d will be out of, or in clearing engagement with, the belt 45, allowing said belt to idle upon the pulley 46a, in respect to the motor, but to remain in operative contact with the belt groove 44 of the wheel 42. Also, at the same time, the belt 45 will be closely clamped between the rollers 29a and 29b, and the said belt 45 driven therebetween upon the manipulation of the crank handle 30a, thereby causing the rotation of the campathed wheel.

My invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment, as above set forth is therefore to be considered in all respects as illustrative and not restrictive, the scope of my invention being indicated by the appended claims rather than by the foregoing description, and all changes which may come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What I claim and desire to secure by Letters Patent is:

1. In an apparatus for sharpening the set teeth of a saw, a frame, a guide for said saw comprising a yoke adjustably secured to said frame and extending transversely over said saw in substantial symmetrical relation thereto, a fiat member having one end thereof rigidly connected to said yoke adjacent each end thereof and the flat members extending from said yoke in parallel relation and at opposite sides of the saw in equally spaced relation thereto, a pair of elongated shoes disposed at opposite sides of the saw and having corresponding ends thereof pivotally connected to the opposite ends of said flat members, a saw engageable sole secured to each of said shoes, and manually operable means cooperating with said yoke and said shoes for simultaneously moving same toward and from the saw.

2. The structure of claim 1, wherein said means comprises a lever including a relatively broad portion and a relatively narrow handle forming portion projecting therefrom, said relatively broad portion being pivoted to one end of said yoke, a pair of right angular members having corresponding ends thereof pivotally connected to said relatively broad portion of said lever at vertically opposite sides of said pivotal connection of said lever and said yoke, one of said right angular members being wholly disposed at one side of said saw, the other angular member having a leg extending across the said saw, the opposite ends of said angular members being connected to said shoes, and a spring having one end thereof connected to said yoke and the opposite end thereof connected to said lever for normally urging said soles toward opposite sides of the saw.

3. In an apparatus for sharpening the set teeth of a saw, a frame, cam wheel rotatably supported by the frame and having a belt groove, a motor driven pulley having a belt groove, a belt engaged within said grooves, an elongated arm having one end thereof pivotally supported by said frame, a grooved roller rotatably supported by said arm adjacent the opposite end thereof and disposed within the belt, a spring engaged with said frame and said arm normally urging said roller into pressure engagement with the inner face of said belt with resulting frictional driving engagement between said belt and the groove in said pulley whereby said cam wheel is driven by said motor, crank operated means pivotally supported by said frame and being in inoperative position when said roller is in pressure engagement with the inner face of the belt, and cooperating means on said arm and said crank operated means operative to hold said roller out of pressure engagement with the inner face of said belt and to move said crank operated means into driving engagement with the belt.

4. The structure according to claim 3, wherein said crank operated means comprises a shank which is pivotally connected to said frame, a grooved roller rotatably supported by said shank and disposed within said belt opposite said first grooved roller, a gooseneck member rigid with said shank and extending upwardly to a point above and adjacent the axis of said first grooved roller, a second roller rotatably supported on said shank externally of said belt, the axes of said rollers supported by said shank being in a plane inclined downwardly in the direction of said first grooved roller whereby said rollers rotatably supported on said shank are out of engagement with said belt when same is engaged by said first grooved roller, and cooperating means on said arm and said gooseneck for elevating the latter and holding said rollers supported by said shank in driving engagement with the belt upon movement of said arm toward the gooseneck.

5. The structure according to claim 4, wherein said cooperating means comprises a finger projecting inwardly from said arm and a recessed catch in said gooseneck in which said finger is received upon swinging said arm toward said belt and said gooseneck being elevated by said finger for bringing said rollers supported on said shank into driving engagement with said belt and concurrently thereby releasing said first grooved roller from pressure engagement with the belt and means for locking said arm in position when said finger and gooseneck are engaged, and crank means engaged with the grooved roller rotatably supported on said shank.

References Cited in the file of this patent UNITED STATES PATENTS 2,333,298 Daggett Nov. 2, 1943 

